How to change bulbapedia username?

Hi! I made my bulbapedia account a while ago (like half a year lol) and I’d like to change my username to match my forums one. I barely use it so I don’t have a user page, but I would like to start editing more. I don’t really like the old username and would rather be called coordinator Lissi on bulbapedia. If someone can help, thanks!
I can add my current username if that helps